CN114062835A - Laser-powered GIL breakdown fault positioning system and method - Google Patents
Laser-powered GIL breakdown fault positioning system and method Download PDFInfo
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Abstract
The invention discloses a laser-powered GIL breakdown fault positioning system, which comprises a laser energy supply unit, an ultrasonic sensor array, a fault positioning monitoring IED array and a background monitoring unit, wherein the laser energy supply unit is connected with the ultrasonic sensor array; the laser energy supply unit comprises a laser power supply base station, a laser power supply energy receiving module and a power supply management and control module. The laser power supply of the invention transmits energy by optical fiber in a laser form, realizes the isolation between high and low potentials, has good safety and ensures the reliability of the fault positioning result.
Description
Technical Field
The invention relates to the technical field of electrician detection, in particular to a laser-powered GIL breakdown fault positioning system and method.
Background
Gas-insulated metal-enclosed transmission lines (GIL) are insulated gas (e.g., SF) using compression6、N2Etc.), the transmission equipment that shell and conductor coaxial arrangement, have high voltage, heavy current, arrange advantages such as nimble, the steady operation, and little with the environmental interaction, extensively use in electric power system.
The GIL adopts a full-sealed design, has a large air chamber and a long pipeline, needs to quickly and accurately locate the fault position and repair the fault position in time if an arc breakdown fault occurs in the operation process, and otherwise seriously affects the stable power transmission of the whole power transmission line and causes huge influence on a power system.
When GIL electric arc is in fault, current pulse is generated, so that the density of a medium in a fault area is changed instantly, and ultrasonic pulse is formed. The existing GIL fault monitoring means basically achieves the purpose of fault positioning by installing a monitoring sensor on a GIL shell, detecting an ultrasonic signal through the monitoring sensor and positioning the position of an ultrasonic source through a related positioning method.
In order to ensure the monitoring accuracy, more monitoring devices need to be arranged on the GIL pipeline, the GIL has higher voltage level and complex electromagnetic environment, the power supply of certain monitoring equipment can be seriously interfered, the potential safety hazard of the power equipment can be easily caused, the important detection means needs to be powered off, and the real-time online monitoring cannot be realized.
Disclosure of Invention
The invention aims to provide a laser-powered GIL breakdown fault positioning system and method, which are safe, reliable, strong in anti-interference capability and capable of carrying out real-time online monitoring on GIL.
In order to achieve the purpose, the laser-powered GIL breakdown fault positioning system is characterized in that: the system comprises a laser energy supply unit, an ultrasonic sensor array, a fault location monitoring IED (Intelligent Electronic Device) array and a background monitoring unit;
the laser energy supply unit comprises a laser power supply base station, a laser power supply energy receiving module and a power supply management and control module, the laser power supply base station is used for converting electric energy on the low-voltage side of a power grid into laser energy transmitted by optical fibers and transmitting the laser energy to the laser power supply energy receiving module through energy optical fibers, the laser power supply energy receiving module is used for converting the laser energy into the electric energy, the power supply management and control module is used for adjusting the voltage of the electric energy into a storage battery charging voltage and monitoring the voltage of the storage battery and the power consumption of the fault location monitoring IED array, the power supply management and control module is also used for transmitting the storage battery voltage and the power consumption monitoring data of the fault location monitoring IED array to the laser power supply energy receiving module, and the laser power supply energy receiving module is used for adaptively adjusting the power of the output electric energy; meanwhile, a communication module in the laser power supply energy receiving module transmits working parameters and monitoring data to the laser power supply base station, so that the laser power supply base station further adjusts the output current of the low-voltage side of the power grid according to the working state.
The ultrasonic sensor array comprises a plurality of ultrasonic sensors which are arranged on the gas insulated metal closed power transmission line, and each ultrasonic sensor is used for respectively carrying out ultrasonic induction on each section of the gas insulated metal closed power transmission line and transmitting the induced ultrasonic characteristic signals of each section of the gas insulated metal closed power transmission line to the fault location monitoring IED array;
the fault location monitoring IED array comprises a plurality of fault location monitoring IEDs corresponding to the ultrasonic sensors, and each fault location monitoring IED is used for sequentially filtering and performing electro-optical conversion on ultrasonic characteristic signals output by the corresponding ultrasonic sensor to form ultrasonic characteristic optical signals of each section of the gas insulated metal closed power transmission line;
the background monitoring unit is used for extracting the amplitude, waveform and frequency of the ultrasonic characteristic light signals of each section of the gas insulated metal closed power transmission line and judging whether breakdown faults occur to each section of the gas insulated metal closed power transmission line.
The invention has the following beneficial effects:
(1) the laser power supply transmits energy through the optical fiber in a laser mode, so that the isolation between high and low potentials is realized, the safety is good, the reliability of a fault positioning result is ensured, and meanwhile, the stable and reliable power supply enables the real-time online monitoring of GIL to be realized;
(2) due to the flexible characteristic of the optical fiber, the optical fiber laser power supply system has strong environmental adaptability, small volume and convenient routing, and the energy transmission optical fiber has low loss and is suitable for long-distance transmission;
(3) the energy supply laser adopts a double-heterojunction semiconductor laser with the wavelength of 808nm, can output high-power laser, has small transmission power loss in a mode that the high-power laser outputs laser through optical fibers, plays a role in isolating energy supply by utilizing the insulating property of the optical fibers, and can avoid the influence of electromagnetic interference near the high-voltage side of GIL;
(4) the invention has the advantages of high-voltage and low-voltage separation, and can monitor the power supply state at the low-voltage side and maintain in time.
Drawings
FIG. 1 is a functional block diagram of the present invention;
FIG. 2 is a schematic block diagram of a laser power supply unit according to the present invention;
the system comprises a laser energy supply unit 1, a laser energy supply unit 11, a laser power supply base station 111, a control unit 112, a laser for energy supply, a first optical fiber communication module 113, a laser energy supply receiving module 12, a laser energy supply receiving module 121, a first power photovoltaic conversion module, a second power photovoltaic conversion module 122, an energy storage module 123, an MPPT control module 124, a first DC/DC boosting module 125, a second DC/DC boosting module 126, a control unit 127, a second optical fiber communication module 128, a power supply management and control module 13, a voltage regulation module 131, a storage battery 132, an electric quantity monitoring module 133, a third optical fiber communication module 134, a 2-ultrasonic sensor array, a 3-fault location monitoring IED array, a 4-background monitoring unit, a 41-data storage unit, a 42-data display unit, a 43-data analysis unit, a 44-breakdown signal location unit, 45-alarm unit.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
the laser-powered GIL breakdown fault location system shown in FIGS. 1 and 2 comprises a laser energy supply unit 1, an ultrasonic sensor array 2, a fault location monitoring IED array 3 and a background monitoring unit 4;
the laser energy supply unit 1 comprises a laser power supply base station 11, a laser power supply energy receiving module 12 and a power supply management and control module 13, the laser power supply base station 11 is located in a low-voltage side station control room, the laser power supply energy receiving unit 12 is arranged at a high-potential ultrasonic sensor end (on a high-voltage side equipment support), the laser power supply base station 11 is used for converting electric energy at a low-voltage side of a power grid into laser energy transmitted by optical fibers and transmitting the laser energy to the laser power supply energy receiving module 12 through energy optical fibers, the laser power supply energy receiving module 12 is used for converting the laser energy into the electric energy, the power supply management and control module 13 is used for adjusting the voltage of the electric energy into storage battery charging voltage, meanwhile, the storage battery voltage and the power consumption of the fault location monitoring IED array 3 can be monitored, the power supply management and control module 13 is also used for transmitting the storage battery voltage and the power consumption monitoring data of the fault location monitoring IED array 3 to the laser power supply energy receiving module 12, the laser power supply energy receiving module 12 is enabled to carry out power regulation of output electric energy;
the ultrasonic sensor array 2 comprises a plurality of ultrasonic sensors which are arranged on the gas insulated metal closed power transmission line, and each ultrasonic sensor is used for respectively carrying out ultrasonic induction on each section of the gas insulated metal closed power transmission line and transmitting the induced ultrasonic characteristic signals of each section of the gas insulated metal closed power transmission line to the fault location monitoring IED array 3;
the fault location monitoring IED array 3 comprises a plurality of fault location monitoring IEDs corresponding to a plurality of ultrasonic sensors, each fault location monitoring IED is used for sequentially filtering, amplifying, collecting and performing electro-optical conversion on ultrasonic characteristic signals output by the corresponding ultrasonic sensor to form ultrasonic characteristic optical signals of each section of the gas insulated metal closed power transmission line, the filtering is used for filtering interference noise, and after filtering, amplifying and collecting are performed, signals with good signal-to-noise ratio are obtained;
the background monitoring unit 4 is used for extracting the amplitude, waveform and frequency of the ultrasonic characteristic light signals of each section of the gas insulated metal closed power transmission line, judging whether breakdown faults occur in each section of the gas insulated metal closed power transmission line according to an arc fault waveform map, and then accurately positioning fault points by adopting a signal arrival time difference calculation method.
In the above technical solution, the laser power supply base station 11 includes a control unit 111, a power supply laser 112 and a first optical fiber communication module 113, where the control unit 111 is configured to control a working state of the power supply laser 112 according to a control instruction of a station control room background monitoring station, the power supply laser 112 is configured to send electric energy to the laser power supply energy receiving module 12 through an energy optical fiber in a laser form, and the first optical fiber communication module 113 is configured to receive working state information of the laser power supply energy receiving module 12 and send the working state information to the station control room background monitoring station, so that operation and maintenance staff monitor a working state of a laser power supply system;
in the above technical solution, the laser Power supply energy receiving module 12 includes a first Power photovoltaic conversion module 121 and an MPPT control module 124, the first Power photovoltaic conversion module 121 is configured to receive laser emitted by the energy supply laser 112, and convert the laser into direct current, the rated output voltage is 24V, and the MPPT (Maximum Power Point Tracking) control module 124 is configured to realize direct current stable output of 5V voltage. The MPPT control module 124 controls the photovoltaic conversion module to operate near a maximum power point, so as to ensure photoelectric energy conversion efficiency.
In the above technical solution, the laser power supply energy receiving module 12 further includes a second power photovoltaic conversion module 122 and a first DC/DC (direct current/direct current) boost module 125, where the second power photovoltaic conversion module 122 is configured to receive the laser light emitted by the energy supply laser 112, convert the laser light into direct current, output the rated voltage 6.5V, and adjust the direct current voltage to 5V output through the first DC/DC boost module 125.
In the above technical solution, the laser power supply energy receiving module 12 further includes an energy storage module 123 and a second DC/DC boost module 126, where the energy storage module 123 is configured to collect heat dissipated by the first power photovoltaic conversion module 121, implement direct current power generation through temperature difference, and adjust the direct current voltage to 5V for output by the second DC/DC boost module 126.
In the above technical solution, the laser power supply energy receiving module 12 further includes a control unit 127, and the control unit 127 is configured to selectively switch among three energy conversion modes, namely the first power photovoltaic conversion module 121, the second power photovoltaic conversion module 122, and the energy storage module 123, and implement power adjustment of the three energy conversion modes. Under normal conditions, electric energy is mainly output through the first power photovoltaic conversion module 121, and if the first power photovoltaic conversion module 121 reaches a limit, the second power photovoltaic conversion module 122 is started to supplement the energy, so that the system output power is increased. Further, when the power consumption required by the external load suddenly increases, the energy storage module 123 is connected to the circuit and used as an energy source in a short time until the power of the photovoltaic conversion module is increased, so that stable power supply is realized. In the aspect of energy management, a MOS transistor is used as a switch and is controlled by the control unit 127.
In the above technical solution, the laser power supply energy receiving module 12 further includes a second optical fiber communication module 128, and the second optical fiber communication module 128 is configured to send switching information and power adjustment information of the three energy conversion modes to the station control room background monitoring station through the first optical fiber communication module 113.
In the above technical solution, the power supply management and control module 13 includes a voltage adjustment module 131, a storage battery 132 and an electric quantity monitoring module 133, the voltage adjustment module 131 is used for adjusting the voltage of the electric energy to charge the storage battery 132 for the storage battery charging voltage, and has a current limiting capability at the same time, so as to avoid an excessive influence of current on the service life of the storage battery 132, the electric quantity monitoring module 133 is used for monitoring the power consumption of the storage battery voltage and the fault location monitoring IED array 3, and the storage battery 132 is used for supplying power to the fault location monitoring IED array 3.
In the above technical solution, the system further includes a third optical fiber communication module 134, where the third optical fiber communication module 134 is configured to transmit the storage battery voltage and the power consumption monitoring data of the fault location monitoring IED array 3 to the second optical fiber communication module 128 of the laser power supply energy receiving module 12, and the control unit 127 controls switching of the three energy conversion modes, so as to implement power regulation of the three energy conversion modes and ensure continuous power supply of the fault location monitoring IED array 3.
In the technical scheme, the ultrasonic sensor is a piezoelectric ceramic sensor and is used for collecting ultrasonic characteristic signals generated by GIL breakdown faults, the detection frequency band is 20-200 kHz, the center frequency is 40-150 kHz, and the ultrasonic sensor is fixed on the GIL shell through a special elastic seat. The ultrasonic sensors are arranged at every two standard knot positions of the GIL.
The fault location monitoring IED is fixed on the GIL mounting bracket, and the ultrasonic characteristic signals are filtered, amplified, collected and subjected to electro-optical conversion, and then are transmitted to the background monitoring system 4 through optical fibers.
The ultrasonic sensor is connected with the fault positioning monitoring IED through a shielding cable, the fault positioning monitoring IED is connected through optical fibers, and the fault positioning monitoring IED is connected with the background monitoring system through the optical fibers. The fault location monitoring IED array 2 collects and monitors ultrasonic signals transmitted by the ultrasonic sensor array 1, and transmits the collected signals to the background monitoring system 4 for analysis and location.
The background monitoring system 4 comprises a data storage unit 41, a data display unit 42, a data analysis unit 43, a breakdown signal positioning unit 44 and an alarm unit 45. The data storage unit 41 is configured to receive the ultrasonic fiber signals output by the fault location monitoring IED array 31, the data display unit 42 is configured to display real-time data and historical data of the GIL ultrasonic signals, and the data analysis unit 43 is configured to analyze the GIL ultrasonic signals, extract effective data such as amplitude, waveform and frequency of the ultrasonic signals, and determine whether breakdown fault occurs in the GIL. The breakdown signal locating unit 44 accurately locates the GIL breakdown fault by the location of the faulty localization monitoring IED 31. The alarm unit 45 is used for giving an alarm when the breakdown fault occurs in the GIL, and reminding operation and maintenance personnel of paying attention to the working state of the GIL.
A laser-powered GIL breakdown fault positioning method comprises the following steps:
step 1: each ultrasonic sensor respectively carries out ultrasonic induction on each section of the gas insulated metal closed transmission line and transmits the induced ultrasonic characteristic signals of each section of the gas insulated metal closed transmission line to the fault location monitoring IED array 3;
step 2: each fault location monitoring IED sequentially filters and performs electro-optical conversion on ultrasonic characteristic signals output by corresponding ultrasonic sensors to form ultrasonic characteristic optical signals of each section of the gas insulated metal closed power transmission line;
the laser power supply base station 11 converts electric energy on the low-voltage side of a power grid into laser energy transmitted by optical fibers, and transmits the laser energy to the laser power supply energy receiving module 12 through energy optical fibers, the laser power supply energy receiving module 12 converts the laser energy into electric energy, the power supply management and control module 13 adjusts the voltage of the electric energy into storage battery charging voltage, and meanwhile, the storage battery voltage and the power consumption of the fault location monitoring IED array 3 can be monitored, the power supply management and control module 13 transmits the storage battery voltage and the power consumption monitoring data of the fault location monitoring IED array 3 to the laser power supply energy receiving module 12, so that the laser power supply energy receiving module 12 performs adaptive adjustment on the power of the output electric energy;
and step 3: the background monitoring unit 4 extracts the amplitude, waveform and frequency of the ultrasonic characteristic light signals of each section of the gas insulated metal closed power transmission line, and judges whether breakdown faults occur in each section of the gas insulated metal closed power transmission line according to the arc fault waveform map. The breakdown signal positioning unit positions the GIL breakdown fault through the fault monitoring IED position where the breakdown fault occurs, and the alarm unit gives an alarm when the breakdown fault occurs in the GIL to remind operation and maintenance personnel of paying attention to the working state of the GIL.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (10)
1. A laser-powered GIL breakdown fault positioning system is characterized in that: the system comprises a laser energy supply unit (1), an ultrasonic sensor array (2), a fault location monitoring IED array (3) and a background monitoring unit (4);
the laser energy supply unit (1) comprises a laser power supply base station (11), a laser power supply energy receiving module (12) and a power supply management and control module (13), the laser power supply base station (11) is used for converting electric energy at the low-voltage side of a power grid into laser energy transmitted by optical fibers, the laser energy is transmitted to a laser power supply energy receiving module (12) through an energy optical fiber, the laser power supply energy receiving module (12) is used for converting the laser energy into electric energy, a power supply management and control module (13) is used for adjusting the voltage of the electric energy into the charging voltage of a storage battery, the power supply management and control module (13) is also used for transmitting the storage battery voltage and the power consumption monitoring data of the fault location monitoring IED array (3) to the laser power supply energy receiving module (12), so that the laser power supply energy receiving module (12) can regulate the power of output electric energy;
the ultrasonic sensor array (2) comprises a plurality of ultrasonic sensors which are arranged on the gas-insulated metal-enclosed transmission line, and each ultrasonic sensor is used for respectively carrying out ultrasonic induction on each section of the gas-insulated metal-enclosed transmission line and transmitting the induced ultrasonic characteristic signals of each section of the gas-insulated metal-enclosed transmission line to the fault location monitoring IED array (3);
the fault location monitoring IED array (3) comprises a plurality of fault location monitoring IEDs corresponding to the ultrasonic sensors, and each fault location monitoring IED is used for sequentially filtering and performing electro-optical conversion on ultrasonic characteristic signals output by the corresponding ultrasonic sensor to form ultrasonic characteristic optical signals of each section of the gas insulated metal closed power transmission line;
the background monitoring unit (4) is used for extracting the amplitude, waveform and frequency of the ultrasonic characteristic light signals of each section of the gas insulated metal closed power transmission line and judging whether breakdown faults occur to each section of the gas insulated metal closed power transmission line.
2. The laser powered GIL breakdown fault locating system of claim 1, wherein: the laser power supply base station (11) comprises a control unit (111), a laser (112) for energy supply and a first optical fiber communication module (113), wherein the control unit (111) is used for controlling the working state of the laser (112) for energy supply according to a control instruction of the station control room background monitoring station, the laser (112) for energy supply is used for sending electric energy to a laser power supply energy receiving module (12) through an energy optical fiber in a laser mode, and the first optical fiber communication module (113) is used for receiving the working state information of the laser power supply energy receiving module (12) and sending the working state information to the station control room background monitoring station.
3. The laser powered GIL breakdown fault locating system of claim 1, wherein: the laser power supply energy receiving module (12) comprises a first power photovoltaic conversion module (121) and an MPPT control module (124), wherein the first power photovoltaic conversion module (121) is used for receiving laser emitted by the energy supply laser (112) and converting the laser into direct current, and the direct current stable output of 5V voltage is realized through the MPPT control module (124).
4. The laser powered GIL breakdown fault locating system of claim 1, wherein: the laser power supply energy receiving module (12) further comprises a second power photovoltaic conversion module (122) and a first DC/DC boost module (125), wherein the second power photovoltaic conversion module (122) is used for receiving the laser emitted by the energy supply laser (112) and converting the laser into direct current, and the direct current voltage is adjusted to be 5V output through the first DC/DC boost module (125).
5. The laser powered GIL breakdown fault locating system of claim 4, wherein: the laser power supply energy receiving module (12) further comprises an energy storage module (123) and a second DC/DC boosting module (126), wherein the energy storage module (123) is used for collecting heat emitted by the first power photovoltaic conversion module (121), direct current power generation is realized through temperature difference, and direct current voltage is adjusted to be 5V to be output through the second DC/DC boosting module (126).
6. The laser powered GIL breakdown fault locating system of claim 5, wherein: the laser power supply energy receiving module (12) further comprises a control unit (127), and the control unit (127) is used for selectively switching among the three energy conversion modes of the first power photovoltaic conversion module (121), the second power photovoltaic conversion module (122) and the energy storage module (123) and realizing power regulation of the three energy conversion modes.
7. The laser powered GIL breakdown fault locating system of claim 6, wherein: the laser power supply energy receiving module (12) further comprises a second optical fiber communication module (128), and the second optical fiber communication module (128) is used for sending switching information and power adjusting information of the three energy conversion modes to the station control room background monitoring station through the first optical fiber communication module (113).
8. The laser powered GIL breakdown fault locating system of claim 7, wherein: the power supply management and control module (13) comprises a voltage adjusting module (131), a storage battery (132) and an electric quantity monitoring module (133), the voltage adjusting module (131) is used for adjusting the voltage of the electric energy to be the storage battery charging voltage to charge the storage battery (132), the electric quantity monitoring module (133) is used for monitoring the storage battery voltage and the electricity consumption of the fault location monitoring IED array (3), and the storage battery (132) is used for supplying power to the fault location monitoring IED array (3).
9. The laser powered GIL breakdown fault locating system of claim 8, wherein: the intelligent energy-saving system also comprises a third optical fiber communication module (134), wherein the third optical fiber communication module (134) is used for transmitting the storage battery voltage and the power consumption monitoring data of the fault positioning monitoring IED array (3) to a second optical fiber communication module (128) of the laser power supply energy receiving module (12), and the control unit (127) is used for controlling the switching of the three energy conversion modes to realize the power regulation of the three energy conversion modes.
10. A laser-powered GIL breakdown fault positioning method is characterized by comprising the following steps:
step 1: each ultrasonic sensor respectively carries out ultrasonic induction on each section of the gas insulated metal closed transmission line and transmits the induced ultrasonic characteristic signals of each section of the gas insulated metal closed transmission line to a fault location monitoring IED array (3);
step 2: each fault location monitoring IED sequentially filters and performs electro-optical conversion on ultrasonic characteristic signals output by corresponding ultrasonic sensors to form ultrasonic characteristic optical signals of each section of the gas insulated metal closed power transmission line;
the laser power supply base station (11) converts electric energy on the low-voltage side of a power grid into laser energy transmitted by optical fibers, the laser energy is transmitted to the laser power supply energy receiving module (12) through energy optical fibers, the laser power supply energy receiving module (12) converts the laser energy into the electric energy, the power supply management and control module (13) adjusts the voltage of the electric energy into storage battery charging voltage, meanwhile, the storage battery voltage and the power consumption of the fault location monitoring IED array (3) can be monitored, the power supply management and control module (13) transmits the storage battery voltage and the power consumption monitoring data of the fault location monitoring IED array (3) to the laser power supply energy receiving module (12), and the laser power supply energy receiving module (12) is enabled to conduct power regulation of output electric energy;
and step 3: the background monitoring unit (4) extracts the amplitude, waveform and frequency of the ultrasonic characteristic light signals of each section of the gas insulated metal closed power transmission line and judges whether breakdown faults occur to each section of the gas insulated metal closed power transmission line.
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| CN116679107A (en) * | 2023-07-28 | 2023-09-01 | 国网安徽省电力有限公司电力科学研究院 | Quantum transformer based on anti-Stokes effect and current detection method |
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